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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534bdd9806622fe9e5ee8ee5c25d98e3bed9472cebde112348b1840dc081d449' 
  AND token = 'xCfYb7mn32dd8ChuHUbY0OWiQU+B7x8f8a2NpsbrJeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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