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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd692f0dcaf43dd6b69f516445746d628322e47c813be6d791e0519c3404cc48' 
  AND token = 'rIe0pYxdMfvRaG0XIivL9s/3g5eEhcpbHzZ3gZBPr4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}