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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b878fc0135753f49e7aac2ddbd17ee546912efd535511037f7e005749d16c1' 
  AND token = 'lMPsZRxJVzfk4kT88ojb7/qfofc0lp8kyJMHX8GItY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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