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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631a2024f89c3e76052848342d58044a71fc4db7f44539c476b9dc74df644b60' 
  AND token = 'bk0kK/uprlP40UDFSYFUtRIHE38P7c++CD29aOETwnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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