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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f79c46290c99c142d40940bd86c4f927ad20299a22f49d6d6b7ce393f565ea' 
  AND token = '4+0G9p+YZfm6kgAsKeTL018sP8TBN61oT0GjGs/B1EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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