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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1532b97c2c2794615de4d8eaa05ba52ebd5df38a48e3cf86703295f0fd3d34' 
  AND token = '9pMszdW6ssWQw4mm7pQDIxf/tcV8WIbpWys3saym5TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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