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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d36135fa29fb190d0a7b909431deaa50b3ad911819c85756d6b31af92b7c8ca' 
  AND token = 'OgUGzHKMHsuCJlxs6GU0lxgsVSQmxroHoS1S8yMUxak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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