SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f499b1c9fd5f2d7e8c5136608c2af82e2314d20ff26cbb485e17f63b74b824' 
  AND token = '/eHjljEjKEXH+3PK6B7KVgwJwJt+GwFGdxJ7E61pSz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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