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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42371ce2ef99a78262606cca25a39ec7c29197fb24d9aaf5389332e6b236f89d' 
  AND token = 'SxS8VQTlqz9Gu+rqR+BvHAkAUgAl07DbEt8AK7LopTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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