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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11483f117808e7d3e64cc3b7b56751d6eec50ab0d2bd5b1e03e3545ee7f368b' 
  AND token = 'ZueFnfiLAK0tk0b8017TOy88rOWOFiqMG0G/qTD4aj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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