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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa522ed40dd9ebc358fec937dd4dbaa824d2874a215dd80cb8c8b6eb55d0de1f' 
  AND token = 'Y0509WQzOLDemmXnLnTBBUT7OD9EX7bUIdgAfJCNy00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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