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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc017c2d8d9dc11d6bc58755790a4371d4ae5296441fe69a2ac4ebf1ff149675' 
  AND token = 'n4G0yTQo43p4CNpbx5saoFT7USaUAD5ry+Qz/wKxNe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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