SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb22833f44b7106c027212a96d703994d1924fcd43486191eb1e69d60e5074d9' 
  AND token = 'Tsz7G6xrNASCRQjKBKkzq2gBLhwopJM2SXSXF9iBWYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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