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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416eec2d34506343399c00471a5b8b8fef80c33bc200fa0508e4c6b45d994d9d' 
  AND token = 'rccAhxcFDlr/SWgAqhaO3QHvA75t7vBxLRnvBM/B9Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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