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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d2a8182c82edccdfbc71314fa0a35b5010bb2862c78ea3f7852fa1d5ff7e78' 
  AND token = 'MSEg//UBdLW73Kw663H3c75iE4ISOXpfVemFPI7d9bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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