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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a408079960eb5ae935adb44c4ca21b02f4fbcd8ee403213b518b5d021cb53d2c' 
  AND token = '3C7IwBFJLRvu9Bvjqe7ldpg/z+NI9glcud841ProowI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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