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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5036ed48689d257ad372981787a4fab8621f8789b4fd2fcebf1065a1967c970b' 
  AND token = 'ncD1JnNt4FHaUDelDo4/2BzVKWHq7f/vlTnlWZdDwB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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