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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c3a532ee0f1480e6d40fe027a6369fca25230b61882c8b486780788e5a37c3' 
  AND token = 'jNjav7vTwP0gw0KmEDU50wIGqWEEt3d6EZqXB/xLrrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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