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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59cc1bccc363950137709b0618c4041b802469eb546751afba425a1321c902a7' 
  AND token = 'IShhNTGb4Kb0izMRL4nc23CsL7dHtNfqDY7j7zr8dp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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