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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4a7793bb113bf989c5305369bdd7e4fc99b7c1a1ac754da35ea6ebe8ebf763' 
  AND token = 'DuEcI5gfpAv6Xo8A4euxfszhuK0d34qR9zNLSJKQDbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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