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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d1a3942ac73fc65bb44a995cbf719b0b951d4a8a03b341141205c52ecde70e' 
  AND token = 't2riv2mJah1X9w+R9m9x5tlRQUx6832ktNrQR082dEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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