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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcaf5c56f6124a1ca29a4f4866145442de633421e0d6bfed009aa927e3ec108' 
  AND token = '57nNzViVjPw7gxNV5QnqgILN9lpUI6um3yQPQCwkcg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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