Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d558fad772e0bd15769c3413e9e83c58870bdd17088e52facd7628cd71d5db' 
  AND token = '83jicjLLIm9d4+GX6S1IWYqD6k0xADMN7bShqW7olkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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