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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ee92515fd9fc2893b3566dcf7acf267e54084bb2d8f28947fae10976ec0622' 
  AND token = 'yQLV6Ugu2iH7nPDdOvTX77ZTYXKA6hr/DoOq0ZgZac0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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