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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd8522683c4fd5b37ce494f5b6a2893d25e8c9333de0eae918949368b4e344d' 
  AND token = 'dqXjU3HrdKX2WvZH9DnyAgc4MK4u9HXkij+R09sJB8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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