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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676f6b1c9ae7f673d99a9105d76c1816109f3add8bb0ec0d2e77c2ba5f75c89c' 
  AND token = 'UFxMghEviOhwpcCt/Mk2QIRD+x+xGlrweGW5nwnCXWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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