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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd50bda880c8ea9176301684b7c5570cb1954dfc0971f5938dd7c0433897aa2' 
  AND token = 'thszil7CyheX5ue7D8i8dRQnDw+qTeb5Ubmsc9kGoEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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