SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf949aeec27788c9727caf968b7f85fb795e1260e9b940e54654e15ed0233a1' 
  AND token = 'ydFPZPWq7MzrUQb/iU0vJxzLtqqiYRAGXnY80qgSkh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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