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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398fb5ba3945d5cc570eb5402034c2bb1e80be692104229de501e99a2da40335' 
  AND token = 'hxm+FZc6fgc7EJnik9E8VG+ydXj6EPNuq8zM0OSmhJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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