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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9afc8123ff979ea822692688d1f292038cfa5e15dd672bdd9b88eb741b87525' 
  AND token = 'I0dbmssSGpR3uCq/pP4tSiSqtuNNU3L3RVUl4EoXKk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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