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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f6ed3bfbe87a360a58d6a7705bd0be256fe65aada98da9498e9ce962be6c2f' 
  AND token = 'NK/piXIMLREVAqch7/pvZr6Xe3IU+UDvK8FvBwIU6NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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