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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d27fe2954d861cb0287fd7714152e9e12b6c2df7609ad90d0f2aa9f1fc0c8bd' 
  AND token = 'LCWxXghQWwA2G9GNg5ttH9M/S3QV1ivx1oDMggJXGtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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