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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f4848c16b7007c0ca787de1174259575200274b43d280e63719dfd655b8dff' 
  AND token = 'BWuMgv8HsoWWwT53O4nTZ45Q5NrvWpIsLkuaeLRT+Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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