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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5063711521355f0ea1d22e0a9c82626051db239d46d1c8c3d6a3738e80c4e722' 
  AND token = 'WCQomvky3Amfp3Yg0WYMdUS/knB59+6xbrDIT1dPKik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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