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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff5fb2155b4b0b1ab92c2811cdcea49ef058c69600a7a193a47effb8f241771' 
  AND token = 'VaOqPAss7goke7+fbA6FJK69Nhr8HNlNcGNkKPl2pIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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