SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098586265b5a7d17dca468dd0677b66cc09d33044bcd974f730aed441a094ecd' 
  AND token = '/VRPIH6ffOOt7YUanRpSGhwl+cR1DZvvwhQyOahZBJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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