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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67b3c104e8ff77e0287a27285bacabe652444b965877fbb4192e14ea6df73c5' 
  AND token = 'rBZ5pVmPwT97UlLXIbZu7tIC2DWbE6WDmrsa7jiKUHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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