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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91caf209405566818911ed5b60d8fb0f48ab9efb3afe681ff458351eeafce207' 
  AND token = 'ba/V9GaIh2uumWfw88yyDEOkVrSFMTp/YgOaEqz2PY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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