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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840ba3f3597bd3c17c4728d0c0ede2b75d178004a119cab777b55cb5ea4d9810' 
  AND token = 'yKJs0KQpDbgSzRlFkV0VFC00Zjh3ElBEWB/GilY2Fa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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