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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502539516c41df542bdaf695dcf91028cd02a8a27d160a28192bd83ccd258b11' 
  AND token = '9k20QmTt8TyEWqkDC4g5tTi4M3qbmmelvEiwz+lgVqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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