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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028ff6cfdeee23a8c6a5af8dcd218b832a7ebab7d51590f3be30a5af7f79118a' 
  AND token = '1enfkiH2KS0iwf0hwyldz5R9VcYgJS4/4HRzTnZc/BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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