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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9b8e0754112453a70358f9115bdf01f51a1b15fb4e33ac9045199581d96010' 
  AND token = 'Rd6uXmUn7rOByHp0c9Kh5hqg/EVnCEFOh5wWz0cI6XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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