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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f55bfa0526e00c987831e89aa8f1542ee0697bc8c084265e0b97a3088c15bf' 
  AND token = 'ZJQinM/2SwlU0IWkSocd9MGSmESYMTIqNXTKH0TFz2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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