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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca69b04a897d73d073f3976668728be0f200b01b001703ab252be7c0ee1398bd' 
  AND token = '2ditcxllZRQY1FCQgpEzXELkAKJ73sB8d2egc+mgNXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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