SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd65ce74d93b2bcb6e6622fcb32d1c88830c281014f77fb039fa4c54659a2fc' 
  AND token = 'NiSg+lfPHruqLDtH/RfKoZFKW+f5QP8Vjl6jpDJvLk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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