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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e35f397a782ea6af803cf48e8e67eaae135da43f56a68303e94ebbba8662c0' 
  AND token = 'p99eXrrpD1vNgpNzEGdjHewYmJd01ZKvyxWMgUt+yzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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