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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4792ed3c79a0b68b051518696a039713829fc755693509fee074377135518cbc' 
  AND token = 'xwD7bCjYJx09S5Tq5xCeQCXMD/Ku7uDytL5+T/ob4TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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