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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da421e7c37ef75693ea121353533aa96e70d1c3640ca1e57138bfe9a19e84ebc' 
  AND token = 'XAdhKxVdPeeyfo88MRXcuvhX7LpOvkeMeVC39aQHpZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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