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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4f5e89e5ab92aa186c6d5fad5c44c24608a19cda65caef400e327f293feeb9' 
  AND token = 'EnOLWV0+3HfGpSbEtj8APaLOcvVFK90Xt4rwK0pNyM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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