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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7e7136f0951d3de51a76da8cdae3daf92f73edc57d09f7ad89ca9aaf726352' 
  AND token = 'iOzQ4pdec+zY8xIGai3WH3xmcjYoYZ9ehqU1RFz8dug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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