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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addcb88a781523cd3b088eaf8a7598e9c3393fd725c70b5fe06368812aae607f' 
  AND token = 'UbO5QF2hlCIZE78Vwl5gzVM+/q2Ybt6LVtwcyDt2m/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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